iCalamus is the publisher for OS X – light as a feather. You can use iCalamus for free. The unregistered version offers a lot. If you want to get even more power, for 129,00 EUR you get a powerful modern DTP program which helps you publish your ideas fast and easily.
The differences are:
| Features in iCalamus | registered | unregistered |
|---|---|---|
| Photographerbook documents |  |
 Preview watermark in local output |
| Normal documents | |
only 2 pages |
| Print output | |
watermark line on documents with two pages |
| OpenType fonts support (real ligatures, etc.) | |
 |
| Export of frames or pages in various image formats | |
|
| Support | |
(only in the forum) |
| External plug-ins | |
|
| LinkBack support | |
|
| Suppression of registration reminder | |
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